Filter media properties of mineral fibres produced by plasma spray

Abstract

The purpose of this study was to determine the properties of fibrous gas filtration media produced from mineral zeolite. Fibres were generated by direct current plasma spray. The paper characterizes morphology, chemical composition, geometrical structure of elementary fibres, and thermal resistance, as well as the filtration properties of fibre media. The diameter of the produced elementary fibres ranged from 0.17 to 0.90 μm and the length ranged from 0.025 to 5.1 mm. The release of fibres from the media in the air stream was noticed, but it was minimized by hot-pressing the formed fibre mats. The fibres kept their properties up to the temperature of 956°C, while further increase in temperature resulted in the filter media becoming shrunk and brittle. The filtration efficiency of the prepared filter mats ranged from 95.34% to 99.99% for aerosol particles ranging in a size between 0.03 and 10.0 μm. Unprocessed fibre media showed the highest filtration efficiency when filtering aerosol particles smaller than 0.1 µm. Hot-pressed filters were characterized by the highest quality factor values, ranging from 0.021 to 0.064 Pa(-1) (average value 0.034 Pa(-1)).

The biocompatibility and mechanical properties of plasma sprayed zirconia coated abutment

“…Given these features, the plasma spray has been widely used in various types of technical areas. 12 In this study, the plasma spray technique will be employed to improve the bond strength between zirconia coating and titanium abutment. We hypothesize that plasma spraying is a reliable technique to prepare zirconia coating on titanium substrate, and that the plasma-sprayed zirconia coatings possess good mechanical properties, biocompatibility, and mechanical compatibility.…”